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а)
![frac{5x}{2} times frac{6}{ {x}^{2} } = 5 times frac{3}{x} = frac{15}{x} frac{5x}{2} times frac{6}{ {x}^{2} } = 5 times frac{3}{x} = frac{15}{x}](https://tex.z-dn.net/?f=+frac%7B5x%7D%7B2%7D++times++frac%7B6%7D%7B+%7Bx%7D%5E%7B2%7D+%7D++%3D+5+times++frac%7B3%7D%7Bx%7D+%3D++frac%7B15%7D%7Bx%7D+)
б)
![(x - 1) times frac{2x + 1}{3x - 3} = (x - 1) times frac{2x + 1}{3(x - 1)} = frac{2x + 1}{3} (x - 1) times frac{2x + 1}{3x - 3} = (x - 1) times frac{2x + 1}{3(x - 1)} = frac{2x + 1}{3}](https://tex.z-dn.net/?f=%28x+-+1%29+times++frac%7B2x+%2B+1%7D%7B3x+-+3%7D++%3D+%28x+-+1%29+times++frac%7B2x+%2B+1%7D%7B3%28x+-+1%29%7D++%3D++frac%7B2x+%2B+1%7D%7B3%7D+)
в)
![frac{3x + 6}{x - 3} times frac{4x - 12}{ {x}^{2} - 4 = } = frac{3(x + 2)}{x - 3} times frac{4(x - 3)}{(x - 2) times (x + 2)} = 3 times frac{4}{x - 2} = frac{12}{x - 2} frac{3x + 6}{x - 3} times frac{4x - 12}{ {x}^{2} - 4 = } = frac{3(x + 2)}{x - 3} times frac{4(x - 3)}{(x - 2) times (x + 2)} = 3 times frac{4}{x - 2} = frac{12}{x - 2}](https://tex.z-dn.net/?f=+frac%7B3x+%2B+6%7D%7Bx+-+3%7D++times++frac%7B4x+-+12%7D%7B+%7Bx%7D%5E%7B2%7D+-+4+%3D+%7D++%3D++frac%7B3%28x+%2B+2%29%7D%7Bx+-+3%7D++times++frac%7B4%28x+-+3%29%7D%7B%28x+-+2%29+times+%28x+%2B+2%29%7D++%3D+3+times++frac%7B4%7D%7Bx+-+2%7D++%3D++frac%7B12%7D%7Bx+-+2%7D+)
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